CoreDNS-1.0.1 Release

This release fixes a crash in the file plugin and has some minor bug fixes for other plugins.
One new plugin was added: nsid, that implements RFC 5001.

Plugins

file fixes a crash when an request with a DO bit (pretty much the default) hits an unsigned zone. The default configuration should recover the go-routine, but this is nonetheless serious. file received some other fixes when returning (secure) delegations.